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Constant current control circuit and method, and constant current control device

A constant current control circuit and constant current control technology, applied in the direction of control/regulation system, regulation of electrical variables, instruments, etc., can solve problems such as increased system cost, poor EMI performance, and increased peak current of energy storage inductors, etc., to achieve Improved performance and reliability, cost savings

Pending Publication Date: 2019-11-29
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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Problems solved by technology

When Tdemg=Ton+Tfree, T=2Tdemg, so the average load current Iout=0.25*(Vref / Rcs), in order to realize the constant current control under different input voltage VIN, the Tfree time cannot be equal to zero, so the constant current control circuit can only Working in the discontinuous mode of the energy storage inductor current leads to an increase in the peak value of the energy storage inductor current, requiring a larger size switch tube M1, which increases the cost of the system; secondly, the constant current control circuit works at the energy storage inductor current In the discontinuous mode, it will cause the switch tube M1 to be uncontrolled when it is turned on, resulting in poor EMI performance of the system, so it is necessary to solve the problems caused by the existing constant current control circuit

Method used

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  • Constant current control circuit and method, and constant current control device
  • Constant current control circuit and method, and constant current control device
  • Constant current control circuit and method, and constant current control device

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Embodiment Construction

[0024] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0025]Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in one...

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Abstract

The invention relates to the technical field of integrated circuits, in particular, to a constant current control circuit and method, and a constant current control device using the constant current control circuit or the constant current control method. The constant current control circuit comprises: an energy storage inductor, a power switch, a detection resistor, a demagnetization time detection module, a reference voltage modulation module and a current peak value control module; and the constant current control circuit achieves constant current control in a critical conduction mode by using a pulse width modulation signal to modulate a reference voltage, so that the performance and the cost of the constant current control circuit are optimized.

Description

technical field [0001] The present invention relates to the technical field of integrated circuits, in particular to a constant current control circuit and method, and a constant current control device using the constant current control circuit or method. Background technique [0002] Figure 1A It is an existing constant current control circuit, the first end of the energy storage inductor L1 is electrically coupled to the input voltage VIN, the second end is coupled to the input end of the switch tube M1, and is also electrically coupled to the anode of the freewheeling diode D1 connected, the control terminal of the switch tube M1 is electrically coupled to the output terminal of the intermittent constant current control module, the output terminal of the switch tube M1 is electrically coupled to the first terminal of the current detection resistor Rcs, and the second terminal of the current detection resistor Rcs is grounded. The cathode of the freewheeling diode D1 is e...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 不公告发明人
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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